If you have questions about our products, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. HY900-1 electret tester (pointer) Main technical indicators: The sensitivity test is divided into three grades: 60 dB -- 40 dB 50 db ~ 30db 40 db ~ 20db 2. Test accuracy: + - 0.5dB 3. Working current range of electret microphone: 0 ~ 1mA, accuracy 2.5% 4. Working voltage of electret microphone: 1.5V 2V 2.5V 3V 4.5V 6V accuracy + - 2% 5. Working… *Subject: *Your Name: User type:PersonalBusinessDistributor *E-mail: *Phone: WhatsApp: Skype: Company: Country:Please select your country...AfghanistanAland IslandsAlbaniaAlgeriaAmerican SamoaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelgiumBelizeBeninBermudaBhutanBoliviaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBritish Virgin IslandsBruneiBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChina HongKongChina taiwanChristmas IslandCocos (Keeling) IslandsColombiaComorosCongoCook IslandsCosta RicaCroatiaCubaCyprusCzech RepublicDemocratic Republic of CongoDenmarkDisputed TerritoryDjiboutiDominicaDominican RepublicEast TimorEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland IslandsFaroe IslandsFederated States of MicronesiaFijiFinlandFranceFrench GuyanaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuamGuatemalaGuineaGuinea-BissauGuyanaHaitiHeard Island and Mcdonald IslandsHondurasHungaryIcelandIndiaIndonesiaIranIraqIraq-Saudi Arabia Neutral ZoneIrelandIsraelItalyIvory CoastJamaicaJapanJordanKazakhstanKenyaKiribatiKuwaitKyrgyzstanLaosLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacauMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMoldovaMonacoMongoliaMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth KoreaNorthern Mariana IslandsNorwayOmanPakistanPalauPalestinian Occupied TerritoriesPanamaPapua New GuineaParaguayPeruPhilippinesPitcairn IslandsPolandPortugalPuerto RicoQatarReunionRomaniaRussiaRwandaSaint Helena and DependenciesSaint Kitts and NevisSaint LuciaSaint Pierre and MiquelonSaint Vincent and the GrenadinesSamoaSan MarinoSao Tome and PrincipeSaudi ArabiaSenegalSerbia and MontenegroSeychellesSierra LeoneSingaporeSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia and South Sandwich IslandsSouth KoreaSpainSpratly IslandsSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyriaTajikistanTanzaniaThailandTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks And Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited KingdomUnited Nations Neutral ZoneUnited StatesUnited States Minor Outlying IslandsUruguayUS Virgin IslandsUzbekistanVanuatuVatican CityVenezuelaVietnamWallis and FutunaWestern SaharaYemenZambiaZimbabwe *Content: Submit Δ